The first fully electric Mercedes-Benz SUV, based on the GLC platform and produced from 2019 to mid-2023. The EQC 400 uses two asynchronous electric motors (one per axle) producing a combined 408 hp, fed by an 80 kWh battery with a real-world range of around 300-350 km. Quiet, refined, and solidly built, it was a first-generation effort that has since been superseded by the newer EQA, EQB, and EQE SUV.
Excellent ride quality and refinement
Battery ages well (8% loss at 234k km)
Multiple early recall campaigns
12V battery drain when parked
Buy if: You want a refined premium electric SUV at a steep used discount and can verify all recall work is completed before purchase.
Avoid if: You need long range or fast DC charging, or you cannot confirm the recall history via the VIN.
Known Issues most common first
12V battery drains flat within 1-2 weeks of inactivity, leaving the car completely unresponsive · more· less
The most commonly reported EQC issue. The 12V battery powers all ancillary systems and can drain within 7-14 days if the car is not driven or plugged in. When it dies, the car becomes completely unresponsive despite a fully charged 80 kWh main battery. Contributing factors include the DC-DC converter only operating when the car is in Ready mode or during HV charging, the Mercedes Me app regularly polling the vehicle, and alarm system background processes. A low 12V battery triggers cascading false warnings including battery malfunction alerts, gear selector errors, and traction system faults. One owner reported 70,000 km of reliable driving with only two issues: a stuck coolant valve and a failed 12V battery. Replacement costs €150-350 plus potential towing charges if stranded. Keeping the car plugged in or using a trickle charger during extended parking prevents the issue. Mercedes has released software updates to reduce standby drain on later production cars.
Faulty coolant switchover valve causes false low coolant warnings and intermittent heating failure · more· less
The EQC shares a thermal management system with the EQA and EQB that uses a heat pump and switchover valve to direct coolant between battery cooling and cabin heating circuits. The switchover valve (part A0005061400, replaced by MBA2975005100) can stick or fail, causing unequal pressures between coolant circuits and triggering false low coolant warnings despite correct fluid levels. Some owners also report the cabin heater blowing cold air intermittently, requiring a restart of the car. Mercedes has addressed this through a service campaign, replacing the shut-off valve along with new radiator caps and actuators. A temporary workaround is releasing pressure by briefly opening both coolant caps when cold, which can reset the warning for several weeks. Dealer repair costs €400-900, though it has been covered under warranty or goodwill on many cars. Air locks in the coolant tank can also cause false warnings and are resolved by bleeding the system.
Manufacturing deviation allows coolant to seep into the electric drive motor, requiring full motor replacement · more· less
Mercedes recalled 10,104 EQC units in China (production dates November 2018 to December 2021) due to insufficient sealing in the electric drive module. When coolant infiltrates the motor windings, the insulation resistance drops, the motor eventually fails, and it must be replaced entirely as the motor is a sealed unit. In extreme cases, the vehicle may not start. A further 3,345 units were recalled in China in late 2022. European-built cars appear to be significantly less affected, and no widespread reports of this issue have been confirmed outside China. However, any coolant level warning should be investigated promptly, as it could indicate this more serious seal leak rather than the less critical valve or airlock issue. Motor replacement costs €3,000-6,000 at a Mercedes dealer.
Battery malfunction warning causes the car to slip into neutral and become unresponsive while driving · more· less
Some EQC owners have experienced sudden battery malfunction warnings where the car slips into neutral and becomes completely unresponsive with no prior indication of a problem. Diagnostic logs show high-voltage errors, but the root cause is often difficult to pinpoint. Causes identified so far include HV battery insulation resistance faults from moisture ingress, power distribution unit failures, and wiring insulation faults between the battery and power distribution unit. The power distribution unit is essentially a junction box with fuses that distributes high voltage to the AC compressor, battery coolant heater, interior heater, and 12V charger. When resolved under the 8-year battery warranty, costs are zero. Out of warranty, the power distribution unit and cable replacement is relatively straightforward if parts are available. Full HV battery replacement costs approximately €60,000-65,000 at Mercedes, though this extreme scenario is rare and the battery warranty covers most situations. One owner reported their replacement HV battery was quoted at approximately €33,000.
Central touchscreen freezes, goes black, or reboots spontaneously, losing climate and navigation controls · more· less
The MBUX system in the EQC can experience complete screen blackouts, frozen displays, or spontaneous reboots. One dealer needed 23 hours to complete all pending software updates, after which the system stabilized. Since the EQC relies on the touchscreen for climate control, a frozen screen means losing access to heating and cooling settings. A soft reset (holding the power button for 10 seconds) resolves most temporary freezes. Mercedes has released multiple software updates to improve stability. In persistent cases, a failed head unit requires replacement at €800-1,500. Ensuring the car runs the latest MBUX firmware is important before purchase. Early 2019-2020 production cars are more susceptible.
Bearings in the front hubs develop micro-movement, causing clicking and clunking noises · more· less
A known issue across the EQC and related EQ models. The bearings in the front hubs develop micro-movement, producing a clicking or clunking noise particularly noticeable when releasing the brake pedal or modulating the throttle. The repair involves removing both front drive axles, applying special grease to the splines, and refitting them. Some dealers have also replaced parts around the front axle area. Stones can also become trapped between the brake disc and protective backing plate, producing a screeching sound that is reportedly quite common on the EQC. The hub bearing regrease is typically covered under warranty, but out of warranty, the labour costs approximately €200-600 depending on the workshop.
First-generation premium EV with typical early-adopter issues
The EQC's electric drivetrain is fundamentally robust, and battery degradation data is encouraging (just 8.5% loss after 234,000 km in one documented case). The main ownership concerns are the 12V battery drain (manageable by keeping the car plugged in), coolant system valve issues (addressed through a service campaign), and the multiple early-production recalls. The motor coolant seal issue reported in China has not been widely replicated in European cars. Since production ended in mid-2023, ensure the car has had all software updates and recalls completed, as the model will receive decreasing dealer attention over time.
Recalls and Technical Service Bulletins
Front differential bolt durability (Feb-Oct 2019, 1,696 vehicles worldwide, entire front drivetrain replaced)
Critical - verify completed
Steering wiring harness damage allowing water ingress, risk of sudden power steering loss (Feb 2019 - Dec 2020, 19,253 vehicles)
Critical - verify completed
Driver airbag missing bolts (production up to Sep 2019)
Critical - verify completed
HV battery housing corrosion and moisture ingress (2019 production, 1,463 vehicles)
Verify completed
Left rear seat backrest lock defect (Jan-Mar 2020)
Verify completed
Side-impact sensor electrical connector not properly latched (selected production dates)
Verify completed
Headlamp adjustment and watertight plug connection (2021-2022 models)
Verify completed
The EQC has had a significant number of recalls, particularly affecting early 2019-2020 production. The front differential bolt and steering wiring harness recalls are the most safety-critical. Contact a Mercedes-Benz dealer with the VIN to verify all recall campaigns and service actions have been completed. Given the model's discontinuation in 2023, ensure all software updates have also been applied.
Warranty Status
Factory warranty (2 years, no km limit)
Expired on all used EQC models
HV battery warranty (8 years / 160,000 km)
Still active on 2019+ models, covers below 70% capacity
Electric motor and inverter
Covered under HV battery warranty (8 years / 160,000 km)
Rust perforation warranty (30 years)
Active on all EQC models
All used EQC models are outside their original 2-year factory warranty. The 8-year / 160,000 km high-voltage battery warranty with a 70% capacity guarantee covers the most expensive component and is transferable to subsequent owners. The 12V battery, MBUX system, coolant valves, and suspension components are not covered under the HV battery warranty. Extended warranty plans may be available through Mercedes dealers, though availability may decrease as the model ages.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.